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Risk and Capital Management - Summary of Assessing Minimum Capital Requirements (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Regulatory Capital Resources [Line Items]    
Risk weighted assets R$ 891,300 R$ 818,072
Credit risk [member]    
Disclosure Of Regulatory Capital Resources [Line Items]    
Risk weighted assets 784,730 714,969
Currency, commodities, and ratios [Member]    
Disclosure Of Regulatory Capital Resources [Line Items]    
Risk weighted assets 25,002 30,270
Operational risk [member]    
Disclosure Of Regulatory Capital Resources [Line Items]    
Risk weighted assets R$ 81,568 R$ 72,833